I got an 'early' 135mm SMC macro Takumar with my 6x7 Mark II body cheaply and find it does NOT foucus to 1:1 unless I add the 6x7 Extension tubes and it is very poor definition at further distances. It's OK for portraits and close-up work though.
<a href="http://www.flickr.com/photos/25850987@N03/3110887140/" title="Bubble-Santa-2 by pentaxpete, on Flickr"><img src="http://farm4.static.flickr.com/3066/3110887140_b5a3b85c95.jpg"